Sasuke would likely be conflicted. On one hand, he and Naruto have a deep bond, but on the other, Sasuke has his own ideas about justice. He might try to stop Naruto at first, reasoning with him. If that fails, he could be forced to choose a side, either to support Naruto's cause if he believes there's some merit to it, or oppose him to protect the shinobi world as he knows it.
Kakashi would be deeply troubled. He's seen Naruto grow up and has always believed in him. He would probably try to understand Naruto's reasons first. Kakashi would attempt to talk Naruto out of it, using his own experiences and their relationship as a teacher - student. If that didn't work, he'd have to face the difficult decision of whether to fight against Naruto, which would be a very painful choice for him.
The villagers of Konoha would be in shock. They've always seen Naruto as their hero, the one who saved them from Pain. But if he starts a war, they'd be divided. Some would still believe in Naruto and think he has a good reason, while others would feel betrayed. This would cause a lot of internal strife within the village, with different factions forming depending on their stance towards Naruto's actions.
Chapter 928, "Only Earned a Few Billion", is the clearest early answer because it turns Is's situation into a concrete plot event. The setup is Zhao Lang has been away for a month., but the pressure keeps building through That trending topic is still hanging on Weibo..
Chapter 813, "She Has a Child?!", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. It opens with In the past, he might have helped Meng WanZhi speak. and closes on Before long, a taxi stopped outside the door, and a round-faced girl....
Chapter 637, "Does President Shang Know That His Own Family Is Already Bankrupt?", is the clearest early answer because it turns Shang Shaojing Su's situation into a concrete plot event. Early on, Jiang Yan laughed, "Hey, big bro, if you'd just said so earlier,....
Chapter 704, "Even if I were a slave, I would be willing!", is the clearest early answer because it turns President Sun's situation into a concrete plot event. Early on, Wu Daoshan looked at Zhao Lang in shock.. By the end, President Sun wiped the sweat from his forehead as he watched the two....
Look to Chapter 1 for the clearest answer. It begins with Jiang Li, I'm warning you, don't set your sights on Yinwan anymore, or..., keeps building through Following a bout of tinnitus, she struggled to open her eyes and finally..., and lands on Yet before she had the chance to teach her a lesson.
The best chapter pointer here is Chapter 3, "Madam, the eldest young master has been missing for over half a month". It opens with Qiao was still annoyed at the attitude of this unknown girl when she heard... and closes on Jiang Yan, forced into a marriage with someone he did not love, had....
Chapter 663, "How Did These Two Start Fighting?!", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter turns that into something concrete by moving from Jiang Shixu received the message in daylight the next day.
Chapter 735, "How is it Him?!", is the clearest early answer because it turns Shao Changqing's situation into a concrete plot event. Early on, Besides..." Yin Le hesitated, "Changqing originally didn't let me say....
If you want the clearest chapter reference, go to Chapter 2. Early on, On the top floor of the Financial Building, a gathering of dark clouds...; later, the chapter leans on How dare Jiang Li hang up his phone?.
A practical answer is Chapter 9, because it turns the idea into a concrete scene. The chapter opens with Exactly, the Qiao Family isn't that great either., adds pressure through Since it was for the Jiang Family's welfare, then as the matriarch, she..., and ends on Qiao, unable to save face.